1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * 7 * This file is part of the SCTP kernel implementation 8 * 9 * This SCTP implementation is free software; 10 * you can redistribute it and/or modify it under the terms of 11 * the GNU General Public License as published by 12 * the Free Software Foundation; either version 2, or (at your option) 13 * any later version. 14 * 15 * This SCTP implementation is distributed in the hope that it 16 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 17 * ************************ 18 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 19 * See the GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with GNU CC; see the file COPYING. If not, see 23 * <http://www.gnu.org/licenses/>. 24 * 25 * Please send any bug reports or fixes you make to the 26 * email addresses: 27 * lksctp developers <linux-sctp@vger.kernel.org> 28 * 29 * Written or modified by: 30 * Randall Stewart <randall@sctp.chicago.il.us> 31 * Ken Morneau <kmorneau@cisco.com> 32 * Qiaobing Xie <qxie1@email.mot.com> 33 * La Monte H.P. Yarroll <piggy@acm.org> 34 * Karl Knutson <karl@athena.chicago.il.us> 35 * Jon Grimm <jgrimm@us.ibm.com> 36 * Xingang Guo <xingang.guo@intel.com> 37 * Hui Huang <hui.huang@nokia.com> 38 * Sridhar Samudrala <sri@us.ibm.com> 39 * Daisy Chang <daisyc@us.ibm.com> 40 * Dajiang Zhang <dajiang.zhang@nokia.com> 41 * Ardelle Fan <ardelle.fan@intel.com> 42 * Ryan Layer <rmlayer@us.ibm.com> 43 * Anup Pemmaiah <pemmaiah@cc.usu.edu> 44 * Kevin Gao <kevin.gao@intel.com> 45 */ 46 47 #ifndef __sctp_structs_h__ 48 #define __sctp_structs_h__ 49 50 #include <linux/ktime.h> 51 #include <linux/rhashtable.h> 52 #include <linux/socket.h> /* linux/in.h needs this!! */ 53 #include <linux/in.h> /* We get struct sockaddr_in. */ 54 #include <linux/in6.h> /* We get struct in6_addr */ 55 #include <linux/ipv6.h> 56 #include <asm/param.h> /* We get MAXHOSTNAMELEN. */ 57 #include <linux/atomic.h> /* This gets us atomic counters. */ 58 #include <linux/skbuff.h> /* We need sk_buff_head. */ 59 #include <linux/workqueue.h> /* We need tq_struct. */ 60 #include <linux/sctp.h> /* We need sctp* header structs. */ 61 #include <net/sctp/auth.h> /* We need auth specific structs */ 62 #include <net/ip.h> /* For inet_skb_parm */ 63 64 /* A convenience structure for handling sockaddr structures. 65 * We should wean ourselves off this. 66 */ 67 union sctp_addr { 68 struct sockaddr_in v4; 69 struct sockaddr_in6 v6; 70 struct sockaddr sa; 71 }; 72 73 /* Forward declarations for data structures. */ 74 struct sctp_globals; 75 struct sctp_endpoint; 76 struct sctp_association; 77 struct sctp_transport; 78 struct sctp_packet; 79 struct sctp_chunk; 80 struct sctp_inq; 81 struct sctp_outq; 82 struct sctp_bind_addr; 83 struct sctp_ulpq; 84 struct sctp_ep_common; 85 struct crypto_shash; 86 struct sctp_stream; 87 88 89 #include <net/sctp/tsnmap.h> 90 #include <net/sctp/ulpevent.h> 91 #include <net/sctp/ulpqueue.h> 92 93 /* Structures useful for managing bind/connect. */ 94 95 struct sctp_bind_bucket { 96 unsigned short port; 97 unsigned short fastreuse; 98 struct hlist_node node; 99 struct hlist_head owner; 100 struct net *net; 101 }; 102 103 struct sctp_bind_hashbucket { 104 spinlock_t lock; 105 struct hlist_head chain; 106 }; 107 108 /* Used for hashing all associations. */ 109 struct sctp_hashbucket { 110 rwlock_t lock; 111 struct hlist_head chain; 112 } __attribute__((__aligned__(8))); 113 114 115 /* The SCTP globals structure. */ 116 extern struct sctp_globals { 117 /* This is a list of groups of functions for each address 118 * family that we support. 119 */ 120 struct list_head address_families; 121 122 /* This is the hash of all endpoints. */ 123 struct sctp_hashbucket *ep_hashtable; 124 /* This is the sctp port control hash. */ 125 struct sctp_bind_hashbucket *port_hashtable; 126 /* This is the hash of all transports. */ 127 struct rhltable transport_hashtable; 128 129 /* Sizes of above hashtables. */ 130 int ep_hashsize; 131 int port_hashsize; 132 133 /* Default initialization values to be applied to new associations. */ 134 __u16 max_instreams; 135 __u16 max_outstreams; 136 137 /* Flag to indicate whether computing and verifying checksum 138 * is disabled. */ 139 bool checksum_disable; 140 } sctp_globals; 141 142 #define sctp_max_instreams (sctp_globals.max_instreams) 143 #define sctp_max_outstreams (sctp_globals.max_outstreams) 144 #define sctp_address_families (sctp_globals.address_families) 145 #define sctp_ep_hashsize (sctp_globals.ep_hashsize) 146 #define sctp_ep_hashtable (sctp_globals.ep_hashtable) 147 #define sctp_port_hashsize (sctp_globals.port_hashsize) 148 #define sctp_port_hashtable (sctp_globals.port_hashtable) 149 #define sctp_transport_hashtable (sctp_globals.transport_hashtable) 150 #define sctp_checksum_disable (sctp_globals.checksum_disable) 151 152 /* SCTP Socket type: UDP or TCP style. */ 153 typedef enum { 154 SCTP_SOCKET_UDP = 0, 155 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 156 SCTP_SOCKET_TCP 157 } sctp_socket_type_t; 158 159 /* Per socket SCTP information. */ 160 struct sctp_sock { 161 /* inet_sock has to be the first member of sctp_sock */ 162 struct inet_sock inet; 163 /* What kind of a socket is this? */ 164 sctp_socket_type_t type; 165 166 /* PF_ family specific functions. */ 167 struct sctp_pf *pf; 168 169 /* Access to HMAC transform. */ 170 struct crypto_shash *hmac; 171 char *sctp_hmac_alg; 172 173 /* What is our base endpointer? */ 174 struct sctp_endpoint *ep; 175 176 struct sctp_bind_bucket *bind_hash; 177 /* Various Socket Options. */ 178 __u16 default_stream; 179 __u32 default_ppid; 180 __u16 default_flags; 181 __u32 default_context; 182 __u32 default_timetolive; 183 __u32 default_rcv_context; 184 int max_burst; 185 186 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 187 * the destination address every heartbeat interval. This value 188 * will be inherited by all new associations. 189 */ 190 __u32 hbinterval; 191 192 /* This is the max_retrans value for new associations. */ 193 __u16 pathmaxrxt; 194 195 /* The initial Path MTU to use for new associations. */ 196 __u32 pathmtu; 197 198 /* The default SACK delay timeout for new associations. */ 199 __u32 sackdelay; 200 __u32 sackfreq; 201 202 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 203 __u32 param_flags; 204 205 struct sctp_initmsg initmsg; 206 struct sctp_rtoinfo rtoinfo; 207 struct sctp_paddrparams paddrparam; 208 struct sctp_event_subscribe subscribe; 209 struct sctp_assocparams assocparams; 210 211 int user_frag; 212 213 __u32 autoclose; 214 __u32 adaptation_ind; 215 __u32 pd_point; 216 __u16 nodelay:1, 217 disable_fragments:1, 218 v4mapped:1, 219 frag_interleave:1, 220 recvrcvinfo:1, 221 recvnxtinfo:1, 222 data_ready_signalled:1; 223 224 atomic_t pd_mode; 225 /* Receive to here while partial delivery is in effect. */ 226 struct sk_buff_head pd_lobby; 227 228 /* These must be the last fields, as they will skipped on copies, 229 * like on accept and peeloff operations 230 */ 231 struct list_head auto_asconf_list; 232 int do_auto_asconf; 233 }; 234 235 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 236 { 237 return (struct sctp_sock *)sk; 238 } 239 240 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 241 { 242 return (struct sock *)sp; 243 } 244 245 #if IS_ENABLED(CONFIG_IPV6) 246 struct sctp6_sock { 247 struct sctp_sock sctp; 248 struct ipv6_pinfo inet6; 249 }; 250 #endif /* CONFIG_IPV6 */ 251 252 253 /* This is our APPLICATION-SPECIFIC state cookie. 254 * THIS IS NOT DICTATED BY THE SPECIFICATION. 255 */ 256 /* These are the parts of an association which we send in the cookie. 257 * Most of these are straight out of: 258 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 259 * 260 */ 261 262 struct sctp_cookie { 263 264 /* My : Tag expected in every inbound packet and sent 265 * Verification: in the INIT or INIT ACK chunk. 266 * Tag : 267 */ 268 __u32 my_vtag; 269 270 /* Peer's : Tag expected in every outbound packet except 271 * Verification: in the INIT chunk. 272 * Tag : 273 */ 274 __u32 peer_vtag; 275 276 /* The rest of these are not from the spec, but really need to 277 * be in the cookie. 278 */ 279 280 /* My Tie Tag : Assist in discovering a restarting association. */ 281 __u32 my_ttag; 282 283 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 284 __u32 peer_ttag; 285 286 /* When does this cookie expire? */ 287 ktime_t expiration; 288 289 /* Number of inbound/outbound streams which are set 290 * and negotiated during the INIT process. 291 */ 292 __u16 sinit_num_ostreams; 293 __u16 sinit_max_instreams; 294 295 /* This is the first sequence number I used. */ 296 __u32 initial_tsn; 297 298 /* This holds the originating address of the INIT packet. */ 299 union sctp_addr peer_addr; 300 301 /* IG Section 2.35.3 302 * Include the source port of the INIT-ACK 303 */ 304 __u16 my_port; 305 306 __u8 prsctp_capable; 307 308 /* Padding for future use */ 309 __u8 padding; 310 311 __u32 adaptation_ind; 312 313 __u8 auth_random[sizeof(struct sctp_paramhdr) + 314 SCTP_AUTH_RANDOM_LENGTH]; 315 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; 316 __u8 auth_chunks[sizeof(struct sctp_paramhdr) + SCTP_AUTH_MAX_CHUNKS]; 317 318 /* This is a shim for my peer's INIT packet, followed by 319 * a copy of the raw address list of the association. 320 * The length of the raw address list is saved in the 321 * raw_addr_list_len field, which will be used at the time when 322 * the association TCB is re-constructed from the cookie. 323 */ 324 __u32 raw_addr_list_len; 325 struct sctp_init_chunk peer_init[0]; 326 }; 327 328 329 /* The format of our cookie that we send to our peer. */ 330 struct sctp_signed_cookie { 331 __u8 signature[SCTP_SECRET_SIZE]; 332 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 333 struct sctp_cookie c; 334 } __packed; 335 336 /* This is another convenience type to allocate memory for address 337 * params for the maximum size and pass such structures around 338 * internally. 339 */ 340 union sctp_addr_param { 341 struct sctp_paramhdr p; 342 struct sctp_ipv4addr_param v4; 343 struct sctp_ipv6addr_param v6; 344 }; 345 346 /* A convenience type to allow walking through the various 347 * parameters and avoid casting all over the place. 348 */ 349 union sctp_params { 350 void *v; 351 struct sctp_paramhdr *p; 352 struct sctp_cookie_preserve_param *life; 353 struct sctp_hostname_param *dns; 354 struct sctp_cookie_param *cookie; 355 struct sctp_supported_addrs_param *sat; 356 struct sctp_ipv4addr_param *v4; 357 struct sctp_ipv6addr_param *v6; 358 union sctp_addr_param *addr; 359 struct sctp_adaptation_ind_param *aind; 360 struct sctp_supported_ext_param *ext; 361 struct sctp_random_param *random; 362 struct sctp_chunks_param *chunks; 363 struct sctp_hmac_algo_param *hmac_algo; 364 struct sctp_addip_param *addip; 365 }; 366 367 /* RFC 2960. Section 3.3.5 Heartbeat. 368 * Heartbeat Information: variable length 369 * The Sender-specific Heartbeat Info field should normally include 370 * information about the sender's current time when this HEARTBEAT 371 * chunk is sent and the destination transport address to which this 372 * HEARTBEAT is sent (see Section 8.3). 373 */ 374 typedef struct sctp_sender_hb_info { 375 struct sctp_paramhdr param_hdr; 376 union sctp_addr daddr; 377 unsigned long sent_at; 378 __u64 hb_nonce; 379 } sctp_sender_hb_info_t; 380 381 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, 382 gfp_t gfp); 383 void sctp_stream_free(struct sctp_stream *stream); 384 void sctp_stream_clear(struct sctp_stream *stream); 385 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new); 386 387 /* What is the current SSN number for this stream? */ 388 #define sctp_ssn_peek(stream, type, sid) \ 389 ((stream)->type[sid].ssn) 390 391 /* Return the next SSN number for this stream. */ 392 #define sctp_ssn_next(stream, type, sid) \ 393 ((stream)->type[sid].ssn++) 394 395 /* Skip over this ssn and all below. */ 396 #define sctp_ssn_skip(stream, type, sid, ssn) \ 397 ((stream)->type[sid].ssn = ssn + 1) 398 399 /* 400 * Pointers to address related SCTP functions. 401 * (i.e. things that depend on the address family.) 402 */ 403 struct sctp_af { 404 int (*sctp_xmit) (struct sk_buff *skb, 405 struct sctp_transport *); 406 int (*setsockopt) (struct sock *sk, 407 int level, 408 int optname, 409 char __user *optval, 410 unsigned int optlen); 411 int (*getsockopt) (struct sock *sk, 412 int level, 413 int optname, 414 char __user *optval, 415 int __user *optlen); 416 int (*compat_setsockopt) (struct sock *sk, 417 int level, 418 int optname, 419 char __user *optval, 420 unsigned int optlen); 421 int (*compat_getsockopt) (struct sock *sk, 422 int level, 423 int optname, 424 char __user *optval, 425 int __user *optlen); 426 void (*get_dst) (struct sctp_transport *t, 427 union sctp_addr *saddr, 428 struct flowi *fl, 429 struct sock *sk); 430 void (*get_saddr) (struct sctp_sock *sk, 431 struct sctp_transport *t, 432 struct flowi *fl); 433 void (*copy_addrlist) (struct list_head *, 434 struct net_device *); 435 int (*cmp_addr) (const union sctp_addr *addr1, 436 const union sctp_addr *addr2); 437 void (*addr_copy) (union sctp_addr *dst, 438 union sctp_addr *src); 439 void (*from_skb) (union sctp_addr *, 440 struct sk_buff *skb, 441 int saddr); 442 void (*from_sk) (union sctp_addr *, 443 struct sock *sk); 444 void (*from_addr_param) (union sctp_addr *, 445 union sctp_addr_param *, 446 __be16 port, int iif); 447 int (*to_addr_param) (const union sctp_addr *, 448 union sctp_addr_param *); 449 int (*addr_valid) (union sctp_addr *, 450 struct sctp_sock *, 451 const struct sk_buff *); 452 sctp_scope_t (*scope) (union sctp_addr *); 453 void (*inaddr_any) (union sctp_addr *, __be16); 454 int (*is_any) (const union sctp_addr *); 455 int (*available) (union sctp_addr *, 456 struct sctp_sock *); 457 int (*skb_iif) (const struct sk_buff *sk); 458 int (*is_ce) (const struct sk_buff *sk); 459 void (*seq_dump_addr)(struct seq_file *seq, 460 union sctp_addr *addr); 461 void (*ecn_capable)(struct sock *sk); 462 __u16 net_header_len; 463 int sockaddr_len; 464 sa_family_t sa_family; 465 struct list_head list; 466 }; 467 468 struct sctp_af *sctp_get_af_specific(sa_family_t); 469 int sctp_register_af(struct sctp_af *); 470 471 /* Protocol family functions. */ 472 struct sctp_pf { 473 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 474 void (*skb_msgname) (struct sk_buff *, char *, int *); 475 int (*af_supported) (sa_family_t, struct sctp_sock *); 476 int (*cmp_addr) (const union sctp_addr *, 477 const union sctp_addr *, 478 struct sctp_sock *); 479 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 480 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 481 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 482 struct sock *(*create_accept_sk) (struct sock *sk, 483 struct sctp_association *asoc, 484 bool kern); 485 int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr); 486 void (*to_sk_saddr)(union sctp_addr *, struct sock *sk); 487 void (*to_sk_daddr)(union sctp_addr *, struct sock *sk); 488 struct sctp_af *af; 489 }; 490 491 492 /* Structure to track chunk fragments that have been acked, but peer 493 * fragments of the same message have not. 494 */ 495 struct sctp_datamsg { 496 /* Chunks waiting to be submitted to lower layer. */ 497 struct list_head chunks; 498 /* Reference counting. */ 499 refcount_t refcnt; 500 /* When is this message no longer interesting to the peer? */ 501 unsigned long expires_at; 502 /* Did the messenge fail to send? */ 503 int send_error; 504 u8 send_failed:1, 505 can_delay; /* should this message be Nagle delayed */ 506 }; 507 508 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 509 struct sctp_sndrcvinfo *, 510 struct iov_iter *); 511 void sctp_datamsg_free(struct sctp_datamsg *); 512 void sctp_datamsg_put(struct sctp_datamsg *); 513 void sctp_chunk_fail(struct sctp_chunk *, int error); 514 int sctp_chunk_abandoned(struct sctp_chunk *); 515 516 /* RFC2960 1.4 Key Terms 517 * 518 * o Chunk: A unit of information within an SCTP packet, consisting of 519 * a chunk header and chunk-specific content. 520 * 521 * As a matter of convenience, we remember the SCTP common header for 522 * each chunk as well as a few other header pointers... 523 */ 524 struct sctp_chunk { 525 struct list_head list; 526 527 atomic_t refcnt; 528 529 /* How many times this chunk have been sent, for prsctp RTX policy */ 530 int sent_count; 531 532 /* This is our link to the per-transport transmitted list. */ 533 struct list_head transmitted_list; 534 535 /* This field is used by chunks that hold fragmented data. 536 * For the first fragment this is the list that holds the rest of 537 * fragments. For the remaining fragments, this is the link to the 538 * frag_list maintained in the first fragment. 539 */ 540 struct list_head frag_list; 541 542 /* This points to the sk_buff containing the actual data. */ 543 struct sk_buff *skb; 544 545 /* In case of GSO packets, this will store the head one */ 546 struct sk_buff *head_skb; 547 548 /* These are the SCTP headers by reverse order in a packet. 549 * Note that some of these may happen more than once. In that 550 * case, we point at the "current" one, whatever that means 551 * for that level of header. 552 */ 553 554 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 555 union sctp_params param_hdr; 556 union { 557 __u8 *v; 558 struct sctp_datahdr *data_hdr; 559 struct sctp_inithdr *init_hdr; 560 struct sctp_sackhdr *sack_hdr; 561 struct sctp_heartbeathdr *hb_hdr; 562 struct sctp_sender_hb_info *hbs_hdr; 563 struct sctp_shutdownhdr *shutdown_hdr; 564 struct sctp_signed_cookie *cookie_hdr; 565 struct sctp_ecnehdr *ecne_hdr; 566 struct sctp_cwrhdr *ecn_cwr_hdr; 567 struct sctp_errhdr *err_hdr; 568 struct sctp_addiphdr *addip_hdr; 569 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 570 struct sctp_authhdr *auth_hdr; 571 } subh; 572 573 __u8 *chunk_end; 574 575 struct sctp_chunkhdr *chunk_hdr; 576 struct sctphdr *sctp_hdr; 577 578 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 579 struct sctp_sndrcvinfo sinfo; 580 581 /* Which association does this belong to? */ 582 struct sctp_association *asoc; 583 584 /* What endpoint received this chunk? */ 585 struct sctp_ep_common *rcvr; 586 587 /* We fill this in if we are calculating RTT. */ 588 unsigned long sent_at; 589 590 /* What is the origin IP address for this chunk? */ 591 union sctp_addr source; 592 /* Destination address for this chunk. */ 593 union sctp_addr dest; 594 595 /* For outbound message, track all fragments for SEND_FAILED. */ 596 struct sctp_datamsg *msg; 597 598 /* For an inbound chunk, this tells us where it came from. 599 * For an outbound chunk, it tells us where we'd like it to 600 * go. It is NULL if we have no preference. 601 */ 602 struct sctp_transport *transport; 603 604 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 605 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 606 * spec violates the principle premis that all chunks are processed 607 * in order. 608 */ 609 struct sk_buff *auth_chunk; 610 611 #define SCTP_CAN_FRTX 0x0 612 #define SCTP_NEED_FRTX 0x1 613 #define SCTP_DONT_FRTX 0x2 614 __u16 rtt_in_progress:1, /* This chunk used for RTT calc? */ 615 has_tsn:1, /* Does this chunk have a TSN yet? */ 616 has_ssn:1, /* Does this chunk have a SSN yet? */ 617 singleton:1, /* Only chunk in the packet? */ 618 end_of_packet:1, /* Last chunk in the packet? */ 619 ecn_ce_done:1, /* Have we processed the ECN CE bit? */ 620 pdiscard:1, /* Discard the whole packet now? */ 621 tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */ 622 data_accepted:1, /* At least 1 chunk accepted */ 623 auth:1, /* IN: was auth'ed | OUT: needs auth */ 624 has_asconf:1, /* IN: have seen an asconf before */ 625 tsn_missing_report:2, /* Data chunk missing counter. */ 626 fast_retransmit:2; /* Is this chunk fast retransmitted? */ 627 }; 628 629 #define sctp_chunk_retransmitted(chunk) (chunk->sent_count > 1) 630 void sctp_chunk_hold(struct sctp_chunk *); 631 void sctp_chunk_put(struct sctp_chunk *); 632 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 633 struct iov_iter *from); 634 void sctp_chunk_free(struct sctp_chunk *); 635 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 636 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 637 const struct sctp_association *, 638 struct sock *, gfp_t gfp); 639 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 640 union sctp_addr *); 641 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 642 643 enum { 644 SCTP_ADDR_NEW, /* new address added to assoc/ep */ 645 SCTP_ADDR_SRC, /* address can be used as source */ 646 SCTP_ADDR_DEL, /* address about to be deleted */ 647 }; 648 649 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 650 struct sctp_sockaddr_entry { 651 struct list_head list; 652 struct rcu_head rcu; 653 union sctp_addr a; 654 __u8 state; 655 __u8 valid; 656 }; 657 658 #define SCTP_ADDRESS_TICK_DELAY 500 659 660 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 661 662 /* This structure holds lists of chunks as we are assembling for 663 * transmission. 664 */ 665 struct sctp_packet { 666 /* These are the SCTP header values (host order) for the packet. */ 667 __u16 source_port; 668 __u16 destination_port; 669 __u32 vtag; 670 671 /* This contains the payload chunks. */ 672 struct list_head chunk_list; 673 674 /* This is the overhead of the sctp and ip headers. */ 675 size_t overhead; 676 /* This is the total size of all chunks INCLUDING padding. */ 677 size_t size; 678 /* This is the maximum size this packet may have */ 679 size_t max_size; 680 681 /* The packet is destined for this transport address. 682 * The function we finally use to pass down to the next lower 683 * layer lives in the transport structure. 684 */ 685 struct sctp_transport *transport; 686 687 /* pointer to the auth chunk for this packet */ 688 struct sctp_chunk *auth; 689 690 u8 has_cookie_echo:1, /* This packet contains a COOKIE-ECHO chunk. */ 691 has_sack:1, /* This packet contains a SACK chunk. */ 692 has_auth:1, /* This packet contains an AUTH chunk */ 693 has_data:1, /* This packet contains at least 1 DATA chunk */ 694 ipfragok:1; /* So let ip fragment this packet */ 695 }; 696 697 void sctp_packet_init(struct sctp_packet *, struct sctp_transport *, 698 __u16 sport, __u16 dport); 699 void sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 700 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 701 struct sctp_chunk *, int, gfp_t); 702 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 703 struct sctp_chunk *); 704 int sctp_packet_transmit(struct sctp_packet *, gfp_t); 705 void sctp_packet_free(struct sctp_packet *); 706 707 static inline int sctp_packet_empty(struct sctp_packet *packet) 708 { 709 return packet->size == packet->overhead; 710 } 711 712 /* This represents a remote transport address. 713 * For local transport addresses, we just use union sctp_addr. 714 * 715 * RFC2960 Section 1.4 Key Terms 716 * 717 * o Transport address: A Transport Address is traditionally defined 718 * by Network Layer address, Transport Layer protocol and Transport 719 * Layer port number. In the case of SCTP running over IP, a 720 * transport address is defined by the combination of an IP address 721 * and an SCTP port number (where SCTP is the Transport protocol). 722 * 723 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 724 * 725 * o The sender keeps a separate congestion control parameter set for 726 * each of the destination addresses it can send to (not each 727 * source-destination pair but for each destination). The parameters 728 * should decay if the address is not used for a long enough time 729 * period. 730 * 731 */ 732 struct sctp_transport { 733 /* A list of transports. */ 734 struct list_head transports; 735 struct rhlist_head node; 736 737 /* Reference counting. */ 738 atomic_t refcnt; 739 /* RTO-Pending : A flag used to track if one of the DATA 740 * chunks sent to this address is currently being 741 * used to compute a RTT. If this flag is 0, 742 * the next DATA chunk sent to this destination 743 * should be used to compute a RTT and this flag 744 * should be set. Every time the RTT 745 * calculation completes (i.e. the DATA chunk 746 * is SACK'd) clear this flag. 747 */ 748 __u32 rto_pending:1, 749 750 /* 751 * hb_sent : a flag that signals that we have a pending 752 * heartbeat. 753 */ 754 hb_sent:1, 755 756 /* Is the Path MTU update pending on this tranport */ 757 pmtu_pending:1, 758 759 dst_pending_confirm:1, /* need to confirm neighbour */ 760 761 /* Has this transport moved the ctsn since we last sacked */ 762 sack_generation:1; 763 u32 dst_cookie; 764 765 struct flowi fl; 766 767 /* This is the peer's IP address and port. */ 768 union sctp_addr ipaddr; 769 770 /* These are the functions we call to handle LLP stuff. */ 771 struct sctp_af *af_specific; 772 773 /* Which association do we belong to? */ 774 struct sctp_association *asoc; 775 776 /* RFC2960 777 * 778 * 12.3 Per Transport Address Data 779 * 780 * For each destination transport address in the peer's 781 * address list derived from the INIT or INIT ACK chunk, a 782 * number of data elements needs to be maintained including: 783 */ 784 /* RTO : The current retransmission timeout value. */ 785 unsigned long rto; 786 787 __u32 rtt; /* This is the most recent RTT. */ 788 789 /* RTTVAR : The current RTT variation. */ 790 __u32 rttvar; 791 792 /* SRTT : The current smoothed round trip time. */ 793 __u32 srtt; 794 795 /* 796 * These are the congestion stats. 797 */ 798 /* cwnd : The current congestion window. */ 799 __u32 cwnd; /* This is the actual cwnd. */ 800 801 /* ssthresh : The current slow start threshold value. */ 802 __u32 ssthresh; 803 804 /* partial : The tracking method for increase of cwnd when in 805 * bytes acked : congestion avoidance mode (see Section 6.2.2) 806 */ 807 __u32 partial_bytes_acked; 808 809 /* Data that has been sent, but not acknowledged. */ 810 __u32 flight_size; 811 812 __u32 burst_limited; /* Holds old cwnd when max.burst is applied */ 813 814 /* Destination */ 815 struct dst_entry *dst; 816 /* Source address. */ 817 union sctp_addr saddr; 818 819 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 820 * the destination address every heartbeat interval. 821 */ 822 unsigned long hbinterval; 823 824 /* SACK delay timeout */ 825 unsigned long sackdelay; 826 __u32 sackfreq; 827 828 /* When was the last time that we heard from this transport? We use 829 * this to pick new active and retran paths. 830 */ 831 ktime_t last_time_heard; 832 833 /* When was the last time that we sent a chunk using this 834 * transport? We use this to check for idle transports 835 */ 836 unsigned long last_time_sent; 837 838 /* Last time(in jiffies) when cwnd is reduced due to the congestion 839 * indication based on ECNE chunk. 840 */ 841 unsigned long last_time_ecne_reduced; 842 843 /* This is the max_retrans value for the transport and will 844 * be initialized from the assocs value. This can be changed 845 * using the SCTP_SET_PEER_ADDR_PARAMS socket option. 846 */ 847 __u16 pathmaxrxt; 848 849 /* This is the partially failed retrans value for the transport 850 * and will be initialized from the assocs value. This can be changed 851 * using the SCTP_PEER_ADDR_THLDS socket option 852 */ 853 int pf_retrans; 854 /* PMTU : The current known path MTU. */ 855 __u32 pathmtu; 856 857 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 858 __u32 param_flags; 859 860 /* The number of times INIT has been sent on this transport. */ 861 int init_sent_count; 862 863 /* state : The current state of this destination, 864 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKNOWN. 865 */ 866 int state; 867 868 /* These are the error stats for this destination. */ 869 870 /* Error count : The current error count for this destination. */ 871 unsigned short error_count; 872 873 /* Per : A timer used by each destination. 874 * Destination : 875 * Timer : 876 * 877 * [Everywhere else in the text this is called T3-rtx. -ed] 878 */ 879 struct timer_list T3_rtx_timer; 880 881 /* Heartbeat timer is per destination. */ 882 struct timer_list hb_timer; 883 884 /* Timer to handle ICMP proto unreachable envets */ 885 struct timer_list proto_unreach_timer; 886 887 /* Timer to handler reconf chunk rtx */ 888 struct timer_list reconf_timer; 889 890 /* Since we're using per-destination retransmission timers 891 * (see above), we're also using per-destination "transmitted" 892 * queues. This probably ought to be a private struct 893 * accessible only within the outqueue, but it's not, yet. 894 */ 895 struct list_head transmitted; 896 897 /* We build bundle-able packets for this transport here. */ 898 struct sctp_packet packet; 899 900 /* This is the list of transports that have chunks to send. */ 901 struct list_head send_ready; 902 903 /* State information saved for SFR_CACC algorithm. The key 904 * idea in SFR_CACC is to maintain state at the sender on a 905 * per-destination basis when a changeover happens. 906 * char changeover_active; 907 * char cycling_changeover; 908 * __u32 next_tsn_at_change; 909 * char cacc_saw_newack; 910 */ 911 struct { 912 /* An unsigned integer, which stores the next TSN to be 913 * used by the sender, at the moment of changeover. 914 */ 915 __u32 next_tsn_at_change; 916 917 /* A flag which indicates the occurrence of a changeover */ 918 char changeover_active; 919 920 /* A flag which indicates whether the change of primary is 921 * the first switch to this destination address during an 922 * active switch. 923 */ 924 char cycling_changeover; 925 926 /* A temporary flag, which is used during the processing of 927 * a SACK to estimate the causative TSN(s)'s group. 928 */ 929 char cacc_saw_newack; 930 } cacc; 931 932 /* 64-bit random number sent with heartbeat. */ 933 __u64 hb_nonce; 934 935 struct rcu_head rcu; 936 }; 937 938 struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *, 939 gfp_t); 940 void sctp_transport_set_owner(struct sctp_transport *, 941 struct sctp_association *); 942 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 943 struct sctp_sock *); 944 void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); 945 void sctp_transport_free(struct sctp_transport *); 946 void sctp_transport_reset_t3_rtx(struct sctp_transport *); 947 void sctp_transport_reset_hb_timer(struct sctp_transport *); 948 void sctp_transport_reset_reconf_timer(struct sctp_transport *transport); 949 int sctp_transport_hold(struct sctp_transport *); 950 void sctp_transport_put(struct sctp_transport *); 951 void sctp_transport_update_rto(struct sctp_transport *, __u32); 952 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 953 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 954 void sctp_transport_burst_limited(struct sctp_transport *); 955 void sctp_transport_burst_reset(struct sctp_transport *); 956 unsigned long sctp_transport_timeout(struct sctp_transport *); 957 void sctp_transport_reset(struct sctp_transport *t); 958 void sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu); 959 void sctp_transport_immediate_rtx(struct sctp_transport *); 960 void sctp_transport_dst_release(struct sctp_transport *t); 961 void sctp_transport_dst_confirm(struct sctp_transport *t); 962 963 964 /* This is the structure we use to queue packets as they come into 965 * SCTP. We write packets to it and read chunks from it. 966 */ 967 struct sctp_inq { 968 /* This is actually a queue of sctp_chunk each 969 * containing a partially decoded packet. 970 */ 971 struct list_head in_chunk_list; 972 /* This is the packet which is currently off the in queue and is 973 * being worked on through the inbound chunk processing. 974 */ 975 struct sctp_chunk *in_progress; 976 977 /* This is the delayed task to finish delivering inbound 978 * messages. 979 */ 980 struct work_struct immediate; 981 }; 982 983 void sctp_inq_init(struct sctp_inq *); 984 void sctp_inq_free(struct sctp_inq *); 985 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 986 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 987 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 988 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 989 990 /* This is the structure we use to hold outbound chunks. You push 991 * chunks in and they automatically pop out the other end as bundled 992 * packets (it calls (*output_handler)()). 993 * 994 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 995 * and 8.2 of the v13 draft. 996 * 997 * It handles retransmissions. The connection to the timeout portion 998 * of the state machine is through sctp_..._timeout() and timeout_handler. 999 * 1000 * If you feed it SACKs, it will eat them. 1001 * 1002 * If you give it big chunks, it will fragment them. 1003 * 1004 * It assigns TSN's to data chunks. This happens at the last possible 1005 * instant before transmission. 1006 * 1007 * When free()'d, it empties itself out via output_handler(). 1008 */ 1009 struct sctp_outq { 1010 struct sctp_association *asoc; 1011 1012 /* Data pending that has never been transmitted. */ 1013 struct list_head out_chunk_list; 1014 1015 unsigned int out_qlen; /* Total length of queued data chunks. */ 1016 1017 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1018 unsigned int error; 1019 1020 /* These are control chunks we want to send. */ 1021 struct list_head control_chunk_list; 1022 1023 /* These are chunks that have been sacked but are above the 1024 * CTSN, or cumulative tsn ack point. 1025 */ 1026 struct list_head sacked; 1027 1028 /* Put chunks on this list to schedule them for 1029 * retransmission. 1030 */ 1031 struct list_head retransmit; 1032 1033 /* Put chunks on this list to save them for FWD TSN processing as 1034 * they were abandoned. 1035 */ 1036 struct list_head abandoned; 1037 1038 /* How many unackd bytes do we have in-flight? */ 1039 __u32 outstanding_bytes; 1040 1041 /* Are we doing fast-rtx on this queue */ 1042 char fast_rtx; 1043 1044 /* Corked? */ 1045 char cork; 1046 }; 1047 1048 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1049 void sctp_outq_teardown(struct sctp_outq *); 1050 void sctp_outq_free(struct sctp_outq*); 1051 void sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk, gfp_t); 1052 int sctp_outq_sack(struct sctp_outq *, struct sctp_chunk *); 1053 int sctp_outq_is_empty(const struct sctp_outq *); 1054 void sctp_outq_restart(struct sctp_outq *); 1055 1056 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1057 sctp_retransmit_reason_t); 1058 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1059 void sctp_outq_uncork(struct sctp_outq *, gfp_t gfp); 1060 void sctp_prsctp_prune(struct sctp_association *asoc, 1061 struct sctp_sndrcvinfo *sinfo, int msg_len); 1062 /* Uncork and flush an outqueue. */ 1063 static inline void sctp_outq_cork(struct sctp_outq *q) 1064 { 1065 q->cork = 1; 1066 } 1067 1068 /* SCTP skb control block. 1069 * sctp_input_cb is currently used on rx and sock rx queue 1070 */ 1071 struct sctp_input_cb { 1072 union { 1073 struct inet_skb_parm h4; 1074 #if IS_ENABLED(CONFIG_IPV6) 1075 struct inet6_skb_parm h6; 1076 #endif 1077 } header; 1078 struct sctp_chunk *chunk; 1079 struct sctp_af *af; 1080 }; 1081 #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0])) 1082 1083 static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb) 1084 { 1085 const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk; 1086 1087 return chunk->head_skb ? : skb; 1088 } 1089 1090 /* These bind address data fields common between endpoints and associations */ 1091 struct sctp_bind_addr { 1092 1093 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1094 * 1095 * SCTP Port: The local SCTP port number the endpoint is 1096 * bound to. 1097 */ 1098 __u16 port; 1099 1100 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1101 * 1102 * Address List: The list of IP addresses that this instance 1103 * has bound. This information is passed to one's 1104 * peer(s) in INIT and INIT ACK chunks. 1105 */ 1106 struct list_head address_list; 1107 }; 1108 1109 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1110 void sctp_bind_addr_free(struct sctp_bind_addr *); 1111 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, 1112 const struct sctp_bind_addr *src, 1113 sctp_scope_t scope, gfp_t gfp, 1114 int flags); 1115 int sctp_bind_addr_dup(struct sctp_bind_addr *dest, 1116 const struct sctp_bind_addr *src, 1117 gfp_t gfp); 1118 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1119 int new_size, __u8 addr_state, gfp_t gfp); 1120 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *); 1121 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1122 struct sctp_sock *); 1123 int sctp_bind_addr_conflict(struct sctp_bind_addr *, const union sctp_addr *, 1124 struct sctp_sock *, struct sctp_sock *); 1125 int sctp_bind_addr_state(const struct sctp_bind_addr *bp, 1126 const union sctp_addr *addr); 1127 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1128 const union sctp_addr *addrs, 1129 int addrcnt, 1130 struct sctp_sock *opt); 1131 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1132 int *addrs_len, 1133 gfp_t gfp); 1134 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1135 __u16 port, gfp_t gfp); 1136 1137 sctp_scope_t sctp_scope(const union sctp_addr *); 1138 int sctp_in_scope(struct net *net, const union sctp_addr *addr, const sctp_scope_t scope); 1139 int sctp_is_any(struct sock *sk, const union sctp_addr *addr); 1140 int sctp_is_ep_boundall(struct sock *sk); 1141 1142 1143 /* What type of endpoint? */ 1144 typedef enum { 1145 SCTP_EP_TYPE_SOCKET, 1146 SCTP_EP_TYPE_ASSOCIATION, 1147 } sctp_endpoint_type_t; 1148 1149 /* 1150 * A common base class to bridge the implmentation view of a 1151 * socket (usually listening) endpoint versus an association's 1152 * local endpoint. 1153 * This common structure is useful for several purposes: 1154 * 1) Common interface for lookup routines. 1155 * a) Subfunctions work for either endpoint or association 1156 * b) Single interface to lookup allows hiding the lookup lock rather 1157 * than acquiring it externally. 1158 * 2) Common interface for the inbound chunk handling/state machine. 1159 * 3) Common object handling routines for reference counting, etc. 1160 * 4) Disentangle association lookup from endpoint lookup, where we 1161 * do not have to find our endpoint to find our association. 1162 * 1163 */ 1164 1165 struct sctp_ep_common { 1166 /* Fields to help us manage our entries in the hash tables. */ 1167 struct hlist_node node; 1168 int hashent; 1169 1170 /* Runtime type information. What kind of endpoint is this? */ 1171 sctp_endpoint_type_t type; 1172 1173 /* Some fields to help us manage this object. 1174 * refcnt - Reference count access to this object. 1175 * dead - Do not attempt to use this object. 1176 */ 1177 atomic_t refcnt; 1178 bool dead; 1179 1180 /* What socket does this endpoint belong to? */ 1181 struct sock *sk; 1182 1183 /* This is where we receive inbound chunks. */ 1184 struct sctp_inq inqueue; 1185 1186 /* This substructure includes the defining parameters of the 1187 * endpoint: 1188 * bind_addr.port is our shared port number. 1189 * bind_addr.address_list is our set of local IP addresses. 1190 */ 1191 struct sctp_bind_addr bind_addr; 1192 }; 1193 1194 1195 /* RFC Section 1.4 Key Terms 1196 * 1197 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1198 * multi-homed host, an SCTP endpoint is represented to its peers as a 1199 * combination of a set of eligible destination transport addresses to 1200 * which SCTP packets can be sent and a set of eligible source 1201 * transport addresses from which SCTP packets can be received. 1202 * All transport addresses used by an SCTP endpoint must use the 1203 * same port number, but can use multiple IP addresses. A transport 1204 * address used by an SCTP endpoint must not be used by another 1205 * SCTP endpoint. In other words, a transport address is unique 1206 * to an SCTP endpoint. 1207 * 1208 * From an implementation perspective, each socket has one of these. 1209 * A TCP-style socket will have exactly one association on one of 1210 * these. An UDP-style socket will have multiple associations hanging 1211 * off one of these. 1212 */ 1213 1214 struct sctp_endpoint { 1215 /* Common substructure for endpoint and association. */ 1216 struct sctp_ep_common base; 1217 1218 /* Associations: A list of current associations and mappings 1219 * to the data consumers for each association. This 1220 * may be in the form of a hash table or other 1221 * implementation dependent structure. The data 1222 * consumers may be process identification 1223 * information such as file descriptors, named pipe 1224 * pointer, or table pointers dependent on how SCTP 1225 * is implemented. 1226 */ 1227 /* This is really a list of struct sctp_association entries. */ 1228 struct list_head asocs; 1229 1230 /* Secret Key: A secret key used by this endpoint to compute 1231 * the MAC. This SHOULD be a cryptographic quality 1232 * random number with a sufficient length. 1233 * Discussion in [RFC1750] can be helpful in 1234 * selection of the key. 1235 */ 1236 __u8 secret_key[SCTP_SECRET_SIZE]; 1237 1238 /* digest: This is a digest of the sctp cookie. This field is 1239 * only used on the receive path when we try to validate 1240 * that the cookie has not been tampered with. We put 1241 * this here so we pre-allocate this once and can re-use 1242 * on every receive. 1243 */ 1244 __u8 *digest; 1245 1246 /* sendbuf acct. policy. */ 1247 __u32 sndbuf_policy; 1248 1249 /* rcvbuf acct. policy. */ 1250 __u32 rcvbuf_policy; 1251 1252 /* SCTP AUTH: array of the HMACs that will be allocated 1253 * we need this per association so that we don't serialize 1254 */ 1255 struct crypto_shash **auth_hmacs; 1256 1257 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1258 struct sctp_hmac_algo_param *auth_hmacs_list; 1259 1260 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1261 struct sctp_chunks_param *auth_chunk_list; 1262 1263 /* SCTP-AUTH: endpoint shared keys */ 1264 struct list_head endpoint_shared_keys; 1265 __u16 active_key_id; 1266 __u8 auth_enable:1, 1267 prsctp_enable:1, 1268 reconf_enable:1; 1269 1270 __u8 strreset_enable; 1271 }; 1272 1273 /* Recover the outter endpoint structure. */ 1274 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1275 { 1276 struct sctp_endpoint *ep; 1277 1278 ep = container_of(base, struct sctp_endpoint, base); 1279 return ep; 1280 } 1281 1282 /* These are function signatures for manipulating endpoints. */ 1283 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1284 void sctp_endpoint_free(struct sctp_endpoint *); 1285 void sctp_endpoint_put(struct sctp_endpoint *); 1286 void sctp_endpoint_hold(struct sctp_endpoint *); 1287 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1288 struct sctp_association *sctp_endpoint_lookup_assoc( 1289 const struct sctp_endpoint *ep, 1290 const union sctp_addr *paddr, 1291 struct sctp_transport **); 1292 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1293 const union sctp_addr *); 1294 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1295 struct net *, const union sctp_addr *); 1296 int sctp_has_association(struct net *net, const union sctp_addr *laddr, 1297 const union sctp_addr *paddr); 1298 1299 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 1300 const struct sctp_association *asoc, 1301 enum sctp_cid cid, struct sctp_init_chunk *peer_init, 1302 struct sctp_chunk *chunk, struct sctp_chunk **err_chunk); 1303 int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk, 1304 const union sctp_addr *peer, 1305 struct sctp_init_chunk *init, gfp_t gfp); 1306 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1307 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1308 1309 struct sctp_inithdr_host { 1310 __u32 init_tag; 1311 __u32 a_rwnd; 1312 __u16 num_outbound_streams; 1313 __u16 num_inbound_streams; 1314 __u32 initial_tsn; 1315 }; 1316 1317 struct sctp_stream_out { 1318 __u16 ssn; 1319 __u8 state; 1320 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1321 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1322 }; 1323 1324 struct sctp_stream_in { 1325 __u16 ssn; 1326 }; 1327 1328 struct sctp_stream { 1329 struct sctp_stream_out *out; 1330 struct sctp_stream_in *in; 1331 __u16 outcnt; 1332 __u16 incnt; 1333 }; 1334 1335 #define SCTP_STREAM_CLOSED 0x00 1336 #define SCTP_STREAM_OPEN 0x01 1337 1338 /* SCTP_GET_ASSOC_STATS counters */ 1339 struct sctp_priv_assoc_stats { 1340 /* Maximum observed rto in the association during subsequent 1341 * observations. Value is set to 0 if no RTO measurement took place 1342 * The transport where the max_rto was observed is returned in 1343 * obs_rto_ipaddr 1344 */ 1345 struct sockaddr_storage obs_rto_ipaddr; 1346 __u64 max_obs_rto; 1347 /* Total In and Out SACKs received and sent */ 1348 __u64 isacks; 1349 __u64 osacks; 1350 /* Total In and Out packets received and sent */ 1351 __u64 opackets; 1352 __u64 ipackets; 1353 /* Total retransmitted chunks */ 1354 __u64 rtxchunks; 1355 /* TSN received > next expected */ 1356 __u64 outofseqtsns; 1357 /* Duplicate Chunks received */ 1358 __u64 idupchunks; 1359 /* Gap Ack Blocks received */ 1360 __u64 gapcnt; 1361 /* Unordered data chunks sent and received */ 1362 __u64 ouodchunks; 1363 __u64 iuodchunks; 1364 /* Ordered data chunks sent and received */ 1365 __u64 oodchunks; 1366 __u64 iodchunks; 1367 /* Control chunks sent and received */ 1368 __u64 octrlchunks; 1369 __u64 ictrlchunks; 1370 }; 1371 1372 /* RFC2960 1373 * 1374 * 12. Recommended Transmission Control Block (TCB) Parameters 1375 * 1376 * This section details a recommended set of parameters that should 1377 * be contained within the TCB for an implementation. This section is 1378 * for illustrative purposes and should not be deemed as requirements 1379 * on an implementation or as an exhaustive list of all parameters 1380 * inside an SCTP TCB. Each implementation may need its own additional 1381 * parameters for optimization. 1382 */ 1383 1384 1385 /* Here we have information about each individual association. */ 1386 struct sctp_association { 1387 1388 /* A base structure common to endpoint and association. 1389 * In this context, it represents the associations's view 1390 * of the local endpoint of the association. 1391 */ 1392 struct sctp_ep_common base; 1393 1394 /* Associations on the same socket. */ 1395 struct list_head asocs; 1396 1397 /* association id. */ 1398 sctp_assoc_t assoc_id; 1399 1400 /* This is our parent endpoint. */ 1401 struct sctp_endpoint *ep; 1402 1403 /* These are those association elements needed in the cookie. */ 1404 struct sctp_cookie c; 1405 1406 /* This is all information about our peer. */ 1407 struct { 1408 /* transport_addr_list 1409 * 1410 * Peer : A list of SCTP transport addresses that the 1411 * Transport : peer is bound to. This information is derived 1412 * Address : from the INIT or INIT ACK and is used to 1413 * List : associate an inbound packet with a given 1414 * : association. Normally this information is 1415 * : hashed or keyed for quick lookup and access 1416 * : of the TCB. 1417 * : The list is also initialized with the list 1418 * : of addresses passed with the sctp_connectx() 1419 * : call. 1420 * 1421 * It is a list of SCTP_transport's. 1422 */ 1423 struct list_head transport_addr_list; 1424 1425 /* rwnd 1426 * 1427 * Peer Rwnd : Current calculated value of the peer's rwnd. 1428 */ 1429 __u32 rwnd; 1430 1431 /* transport_count 1432 * 1433 * Peer : A count of the number of peer addresses 1434 * Transport : in the Peer Transport Address List. 1435 * Address : 1436 * Count : 1437 */ 1438 __u16 transport_count; 1439 1440 /* port 1441 * The transport layer port number. 1442 */ 1443 __u16 port; 1444 1445 /* primary_path 1446 * 1447 * Primary : This is the current primary destination 1448 * Path : transport address of the peer endpoint. It 1449 * : may also specify a source transport address 1450 * : on this endpoint. 1451 * 1452 * All of these paths live on transport_addr_list. 1453 * 1454 * At the bakeoffs, we discovered that the intent of 1455 * primaryPath is that it only changes when the ULP 1456 * asks to have it changed. We add the activePath to 1457 * designate the connection we are currently using to 1458 * transmit new data and most control chunks. 1459 */ 1460 struct sctp_transport *primary_path; 1461 1462 /* Cache the primary path address here, when we 1463 * need a an address for msg_name. 1464 */ 1465 union sctp_addr primary_addr; 1466 1467 /* active_path 1468 * The path that we are currently using to 1469 * transmit new data and most control chunks. 1470 */ 1471 struct sctp_transport *active_path; 1472 1473 /* retran_path 1474 * 1475 * RFC2960 6.4 Multi-homed SCTP Endpoints 1476 * ... 1477 * Furthermore, when its peer is multi-homed, an 1478 * endpoint SHOULD try to retransmit a chunk to an 1479 * active destination transport address that is 1480 * different from the last destination address to 1481 * which the DATA chunk was sent. 1482 */ 1483 struct sctp_transport *retran_path; 1484 1485 /* Pointer to last transport I have sent on. */ 1486 struct sctp_transport *last_sent_to; 1487 1488 /* This is the last transport I have received DATA on. */ 1489 struct sctp_transport *last_data_from; 1490 1491 /* 1492 * Mapping An array of bits or bytes indicating which out of 1493 * Array order TSN's have been received (relative to the 1494 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1495 * order packets have been received, this array 1496 * will be set to all zero. This structure may be 1497 * in the form of a circular buffer or bit array. 1498 * 1499 * Last Rcvd : This is the last TSN received in 1500 * TSN : sequence. This value is set initially by 1501 * : taking the peer's Initial TSN, received in 1502 * : the INIT or INIT ACK chunk, and subtracting 1503 * : one from it. 1504 * 1505 * Throughout most of the specification this is called the 1506 * "Cumulative TSN ACK Point". In this case, we 1507 * ignore the advice in 12.2 in favour of the term 1508 * used in the bulk of the text. This value is hidden 1509 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1510 */ 1511 struct sctp_tsnmap tsn_map; 1512 1513 /* This mask is used to disable sending the ASCONF chunk 1514 * with specified parameter to peer. 1515 */ 1516 __be16 addip_disabled_mask; 1517 1518 /* These are capabilities which our peer advertised. */ 1519 __u8 ecn_capable:1, /* Can peer do ECN? */ 1520 ipv4_address:1, /* Peer understands IPv4 addresses? */ 1521 ipv6_address:1, /* Peer understands IPv6 addresses? */ 1522 hostname_address:1, /* Peer understands DNS addresses? */ 1523 asconf_capable:1, /* Does peer support ADDIP? */ 1524 prsctp_capable:1, /* Can peer do PR-SCTP? */ 1525 reconf_capable:1, /* Can peer do RE-CONFIG? */ 1526 auth_capable:1; /* Is peer doing SCTP-AUTH? */ 1527 1528 /* sack_needed : This flag indicates if the next received 1529 * : packet is to be responded to with a 1530 * : SACK. This is initialized to 0. When a packet 1531 * : is received sack_cnt is incremented. If this value 1532 * : reaches 2 or more, a SACK is sent and the 1533 * : value is reset to 0. Note: This is used only 1534 * : when no DATA chunks are received out of 1535 * : order. When DATA chunks are out of order, 1536 * : SACK's are not delayed (see Section 6). 1537 */ 1538 __u8 sack_needed:1, /* Do we need to sack the peer? */ 1539 sack_generation:1, 1540 zero_window_announced:1; 1541 __u32 sack_cnt; 1542 1543 __u32 adaptation_ind; /* Adaptation Code point. */ 1544 1545 struct sctp_inithdr_host i; 1546 void *cookie; 1547 int cookie_len; 1548 1549 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1550 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1551 * Initial TSN Value minus 1 1552 */ 1553 __u32 addip_serial; 1554 1555 /* SCTP-AUTH: We need to know pears random number, hmac list 1556 * and authenticated chunk list. All that is part of the 1557 * cookie and these are just pointers to those locations 1558 */ 1559 sctp_random_param_t *peer_random; 1560 sctp_chunks_param_t *peer_chunks; 1561 sctp_hmac_algo_param_t *peer_hmacs; 1562 } peer; 1563 1564 /* State : A state variable indicating what state the 1565 * : association is in, i.e. COOKIE-WAIT, 1566 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1567 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1568 * 1569 * Note: No "CLOSED" state is illustrated since if a 1570 * association is "CLOSED" its TCB SHOULD be removed. 1571 * 1572 * In this implementation we DO have a CLOSED 1573 * state which is used during initiation and shutdown. 1574 * 1575 * State takes values from SCTP_STATE_*. 1576 */ 1577 sctp_state_t state; 1578 1579 /* Overall : The overall association error count. 1580 * Error Count : [Clear this any time I get something.] 1581 */ 1582 int overall_error_count; 1583 1584 /* The cookie life I award for any cookie. */ 1585 ktime_t cookie_life; 1586 1587 /* These are the association's initial, max, and min RTO values. 1588 * These values will be initialized by system defaults, but can 1589 * be modified via the SCTP_RTOINFO socket option. 1590 */ 1591 unsigned long rto_initial; 1592 unsigned long rto_max; 1593 unsigned long rto_min; 1594 1595 /* Maximum number of new data packets that can be sent in a burst. */ 1596 int max_burst; 1597 1598 /* This is the max_retrans value for the association. This value will 1599 * be initialized initialized from system defaults, but can be 1600 * modified by the SCTP_ASSOCINFO socket option. 1601 */ 1602 int max_retrans; 1603 1604 /* This is the partially failed retrans value for the transport 1605 * and will be initialized from the assocs value. This can be 1606 * changed using the SCTP_PEER_ADDR_THLDS socket option 1607 */ 1608 int pf_retrans; 1609 1610 /* Maximum number of times the endpoint will retransmit INIT */ 1611 __u16 max_init_attempts; 1612 1613 /* How many times have we resent an INIT? */ 1614 __u16 init_retries; 1615 1616 /* The largest timeout or RTO value to use in attempting an INIT */ 1617 unsigned long max_init_timeo; 1618 1619 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1620 * the destination address every heartbeat interval. This value 1621 * will be inherited by all new transports. 1622 */ 1623 unsigned long hbinterval; 1624 1625 /* This is the max_retrans value for new transports in the 1626 * association. 1627 */ 1628 __u16 pathmaxrxt; 1629 1630 /* Flag that path mtu update is pending */ 1631 __u8 pmtu_pending; 1632 1633 /* Association : The smallest PMTU discovered for all of the 1634 * PMTU : peer's transport addresses. 1635 */ 1636 __u32 pathmtu; 1637 1638 /* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */ 1639 __u32 param_flags; 1640 1641 __u32 sackfreq; 1642 /* SACK delay timeout */ 1643 unsigned long sackdelay; 1644 1645 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1646 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1647 1648 /* Transport to which SHUTDOWN chunk was last sent. */ 1649 struct sctp_transport *shutdown_last_sent_to; 1650 1651 /* Transport to which INIT chunk was last sent. */ 1652 struct sctp_transport *init_last_sent_to; 1653 1654 /* How many times have we resent a SHUTDOWN */ 1655 int shutdown_retries; 1656 1657 /* Next TSN : The next TSN number to be assigned to a new 1658 * : DATA chunk. This is sent in the INIT or INIT 1659 * : ACK chunk to the peer and incremented each 1660 * : time a DATA chunk is assigned a TSN 1661 * : (normally just prior to transmit or during 1662 * : fragmentation). 1663 */ 1664 __u32 next_tsn; 1665 1666 /* 1667 * Last Rcvd : This is the last TSN received in sequence. This value 1668 * TSN : is set initially by taking the peer's Initial TSN, 1669 * : received in the INIT or INIT ACK chunk, and 1670 * : subtracting one from it. 1671 * 1672 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1673 */ 1674 1675 __u32 ctsn_ack_point; 1676 1677 /* PR-SCTP Advanced.Peer.Ack.Point */ 1678 __u32 adv_peer_ack_point; 1679 1680 /* Highest TSN that is acknowledged by incoming SACKs. */ 1681 __u32 highest_sacked; 1682 1683 /* TSN marking the fast recovery exit point */ 1684 __u32 fast_recovery_exit; 1685 1686 /* Flag to track the current fast recovery state */ 1687 __u8 fast_recovery; 1688 1689 /* The number of unacknowledged data chunks. Reported through 1690 * the SCTP_STATUS sockopt. 1691 */ 1692 __u16 unack_data; 1693 1694 /* The total number of data chunks that we've had to retransmit 1695 * as the result of a T3 timer expiration 1696 */ 1697 __u32 rtx_data_chunks; 1698 1699 /* This is the association's receive buffer space. This value is used 1700 * to set a_rwnd field in an INIT or a SACK chunk. 1701 */ 1702 __u32 rwnd; 1703 1704 /* This is the last advertised value of rwnd over a SACK chunk. */ 1705 __u32 a_rwnd; 1706 1707 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1708 * to slop over a maximum of the association's frag_point. 1709 */ 1710 __u32 rwnd_over; 1711 1712 /* Keeps treack of rwnd pressure. This happens when we have 1713 * a window, but not recevie buffer (i.e small packets). This one 1714 * is releases slowly (1 PMTU at a time ). 1715 */ 1716 __u32 rwnd_press; 1717 1718 /* This is the sndbuf size in use for the association. 1719 * This corresponds to the sndbuf size for the association, 1720 * as specified in the sk->sndbuf. 1721 */ 1722 int sndbuf_used; 1723 1724 /* This is the amount of memory that this association has allocated 1725 * in the receive path at any given time. 1726 */ 1727 atomic_t rmem_alloc; 1728 1729 /* This is the wait queue head for send requests waiting on 1730 * the association sndbuf space. 1731 */ 1732 wait_queue_head_t wait; 1733 1734 /* The message size at which SCTP fragmentation will occur. */ 1735 __u32 frag_point; 1736 __u32 user_frag; 1737 1738 /* Counter used to count INIT errors. */ 1739 int init_err_counter; 1740 1741 /* Count the number of INIT cycles (for doubling timeout). */ 1742 int init_cycle; 1743 1744 /* Default send parameters. */ 1745 __u16 default_stream; 1746 __u16 default_flags; 1747 __u32 default_ppid; 1748 __u32 default_context; 1749 __u32 default_timetolive; 1750 1751 /* Default receive parameters */ 1752 __u32 default_rcv_context; 1753 1754 /* Stream arrays */ 1755 struct sctp_stream stream; 1756 1757 /* All outbound chunks go through this structure. */ 1758 struct sctp_outq outqueue; 1759 1760 /* A smart pipe that will handle reordering and fragmentation, 1761 * as well as handle passing events up to the ULP. 1762 */ 1763 struct sctp_ulpq ulpq; 1764 1765 /* Last TSN that caused an ECNE Chunk to be sent. */ 1766 __u32 last_ecne_tsn; 1767 1768 /* Last TSN that caused a CWR Chunk to be sent. */ 1769 __u32 last_cwr_tsn; 1770 1771 /* How many duplicated TSNs have we seen? */ 1772 int numduptsns; 1773 1774 /* These are to support 1775 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1776 * and Enforcement of Flow and Message Limits" 1777 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1778 * or "ADDIP" for short. 1779 */ 1780 1781 1782 1783 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1784 * 1785 * R1) One and only one ASCONF Chunk MAY be in transit and 1786 * unacknowledged at any one time. If a sender, after sending 1787 * an ASCONF chunk, decides it needs to transfer another 1788 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1789 * returns from the previous ASCONF Chunk before sending a 1790 * subsequent ASCONF. Note this restriction binds each side, 1791 * so at any time two ASCONF may be in-transit on any given 1792 * association (one sent from each endpoint). 1793 * 1794 * [This is our one-and-only-one ASCONF in flight. If we do 1795 * not have an ASCONF in flight, this is NULL.] 1796 */ 1797 struct sctp_chunk *addip_last_asconf; 1798 1799 /* ADDIP Section 5.2 Upon reception of an ASCONF Chunk. 1800 * 1801 * This is needed to implement itmes E1 - E4 of the updated 1802 * spec. Here is the justification: 1803 * 1804 * Since the peer may bundle multiple ASCONF chunks toward us, 1805 * we now need the ability to cache multiple ACKs. The section 1806 * describes in detail how they are cached and cleaned up. 1807 */ 1808 struct list_head asconf_ack_list; 1809 1810 /* These ASCONF chunks are waiting to be sent. 1811 * 1812 * These chunaks can't be pushed to outqueue until receiving 1813 * ASCONF_ACK for the previous ASCONF indicated by 1814 * addip_last_asconf, so as to guarantee that only one ASCONF 1815 * is in flight at any time. 1816 * 1817 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1818 * 1819 * In defining the ASCONF Chunk transfer procedures, it is 1820 * essential that these transfers MUST NOT cause congestion 1821 * within the network. To achieve this, we place these 1822 * restrictions on the transfer of ASCONF Chunks: 1823 * 1824 * R1) One and only one ASCONF Chunk MAY be in transit and 1825 * unacknowledged at any one time. If a sender, after sending 1826 * an ASCONF chunk, decides it needs to transfer another 1827 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1828 * returns from the previous ASCONF Chunk before sending a 1829 * subsequent ASCONF. Note this restriction binds each side, 1830 * so at any time two ASCONF may be in-transit on any given 1831 * association (one sent from each endpoint). 1832 * 1833 * 1834 * [I really think this is EXACTLY the sort of intelligence 1835 * which already resides in sctp_outq. Please move this 1836 * queue and its supporting logic down there. --piggy] 1837 */ 1838 struct list_head addip_chunk_list; 1839 1840 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1841 * 1842 * A2) A serial number should be assigned to the Chunk. The 1843 * serial number SHOULD be a monotonically increasing 1844 * number. The serial number SHOULD be initialized at 1845 * the start of the association to the same value as the 1846 * Initial TSN and every time a new ASCONF chunk is created 1847 * it is incremented by one after assigning the serial number 1848 * to the newly created chunk. 1849 * 1850 * ADDIP 1851 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1852 * 1853 * Serial Number : 32 bits (unsigned integer) 1854 * 1855 * This value represents a Serial Number for the ASCONF 1856 * Chunk. The valid range of Serial Number is from 0 to 1857 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1858 * after reaching 4294967295. 1859 */ 1860 __u32 addip_serial; 1861 int src_out_of_asoc_ok; 1862 union sctp_addr *asconf_addr_del_pending; 1863 struct sctp_transport *new_transport; 1864 1865 /* SCTP AUTH: list of the endpoint shared keys. These 1866 * keys are provided out of band by the user applicaton 1867 * and can't change during the lifetime of the association 1868 */ 1869 struct list_head endpoint_shared_keys; 1870 1871 /* SCTP AUTH: 1872 * The current generated assocaition shared key (secret) 1873 */ 1874 struct sctp_auth_bytes *asoc_shared_key; 1875 1876 /* SCTP AUTH: hmac id of the first peer requested algorithm 1877 * that we support. 1878 */ 1879 __u16 default_hmac_id; 1880 1881 __u16 active_key_id; 1882 1883 __u8 need_ecne:1, /* Need to send an ECNE Chunk? */ 1884 temp:1, /* Is it a temporary association? */ 1885 force_delay:1, 1886 prsctp_enable:1, 1887 reconf_enable:1; 1888 1889 __u8 strreset_enable; 1890 __u8 strreset_outstanding; /* request param count on the fly */ 1891 1892 __u32 strreset_outseq; /* Update after receiving response */ 1893 __u32 strreset_inseq; /* Update after receiving request */ 1894 __u32 strreset_result[2]; /* save the results of last 2 responses */ 1895 1896 struct sctp_chunk *strreset_chunk; /* save request chunk */ 1897 1898 struct sctp_priv_assoc_stats stats; 1899 1900 int sent_cnt_removable; 1901 1902 __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1]; 1903 __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1]; 1904 }; 1905 1906 1907 /* An eyecatcher for determining if we are really looking at an 1908 * association data structure. 1909 */ 1910 enum { 1911 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1912 }; 1913 1914 /* Recover the outter association structure. */ 1915 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1916 { 1917 struct sctp_association *asoc; 1918 1919 asoc = container_of(base, struct sctp_association, base); 1920 return asoc; 1921 } 1922 1923 /* These are function signatures for manipulating associations. */ 1924 1925 1926 struct sctp_association * 1927 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1928 sctp_scope_t scope, gfp_t gfp); 1929 void sctp_association_free(struct sctp_association *); 1930 void sctp_association_put(struct sctp_association *); 1931 void sctp_association_hold(struct sctp_association *); 1932 1933 struct sctp_transport *sctp_assoc_choose_alter_transport( 1934 struct sctp_association *, struct sctp_transport *); 1935 void sctp_assoc_update_retran_path(struct sctp_association *); 1936 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1937 const union sctp_addr *); 1938 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1939 const union sctp_addr *laddr); 1940 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1941 const union sctp_addr *address, 1942 const gfp_t gfp, 1943 const int peer_state); 1944 void sctp_assoc_del_peer(struct sctp_association *asoc, 1945 const union sctp_addr *addr); 1946 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1947 struct sctp_transport *peer); 1948 void sctp_assoc_control_transport(struct sctp_association *, 1949 struct sctp_transport *, 1950 sctp_transport_cmd_t, sctp_sn_error_t); 1951 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1952 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1953 struct net *, 1954 const union sctp_addr *, 1955 const union sctp_addr *); 1956 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1957 int sctp_assoc_update(struct sctp_association *old, 1958 struct sctp_association *new); 1959 1960 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1961 1962 void sctp_assoc_sync_pmtu(struct sctp_association *asoc); 1963 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned int); 1964 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned int); 1965 void sctp_assoc_set_primary(struct sctp_association *, 1966 struct sctp_transport *); 1967 void sctp_assoc_del_nonprimary_peers(struct sctp_association *, 1968 struct sctp_transport *); 1969 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1970 sctp_scope_t, gfp_t); 1971 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1972 struct sctp_cookie*, 1973 gfp_t gfp); 1974 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1975 void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc); 1976 struct sctp_chunk *sctp_assoc_lookup_asconf_ack( 1977 const struct sctp_association *asoc, 1978 __be32 serial); 1979 void sctp_asconf_queue_teardown(struct sctp_association *asoc); 1980 1981 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1982 const union sctp_addr *ss2); 1983 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1984 1985 /* A convenience structure to parse out SCTP specific CMSGs. */ 1986 typedef struct sctp_cmsgs { 1987 struct sctp_initmsg *init; 1988 struct sctp_sndrcvinfo *srinfo; 1989 struct sctp_sndinfo *sinfo; 1990 } sctp_cmsgs_t; 1991 1992 /* Structure for tracking memory objects */ 1993 typedef struct { 1994 char *label; 1995 atomic_t *counter; 1996 } sctp_dbg_objcnt_entry_t; 1997 1998 #endif /* __sctp_structs_h__ */ 1999